How Long Do Lithium Batteries Last? Charge Cycles Explained + Key Factors Affecting Lifespan
2025-05-27
Lithium-ion batteries are a kind of battery that uses lithium metals or lithium alloy to be the negative electrode material and they also include a non-aqueous electrolyte solution. The extreme active chemical properties of lithium metal means that it has very high environmental requirements to process, store, and use and as a result, lithium batteries have not been used widely for a long time. However, because of technology that contiues to advance, lithium-iron batteries have become mainstream today. But how long is the service life of a lithium-ion battery?
Lithium-ion battery lifespan
Is it correct that lithium-ion batteries can only be charged and discharged 500 times? In reality, it does not accurately reflect the situation. The life of the battery is referred to as "500 times" not for the charge itself but for a charge and discharge cycle. A charge cycle is from completely charged state to discharged state and then from discharged state back to completely charged state.
A charge cycle is not plugged in on one occassion and removed without completing a charge cycle. It takes several times of charging to complete a charge cycle and the capacity of the battery decreases every time. After several charge cycles the more durable batteries can still give you about 80% of the original capacity. There are lithium battery powered products that still work perfectly well after several years. Remember that when the lithium battery reaches its end of life it will still need replacing with a new battery.
Taking into account that several factors can come into play in real life, especially with depth of discharge, "500 charge cycles" can only be a general reference to battery life. Generally speaking, the life of lithium battery is associated with the completed charge cycles rather than an actual number of charge completions on its own.
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